Dust mask



FIG. 1 is a perspective view of a dust mask showing my new design.

FIG. 2 is a left side elevation view of the dust mask shown in FIG. 1showing my new design, the right side elevation view being a mirrorimage.

FIG. 3 is a top plan view of the dust mask shown in FIG. 1 showing mynew design.

FIG. 4 is a front elevation view of the dust mask shown in FIG. 1showing my new design.

FIG. 5 is a rear elevation view of the dust mask shown in FIG. 1 showingmy new design; and,

FIG. 6 is a bottom plan view of the dust mask shown in FIG. 1 showing mynew design.

The broken lines in FIG. 5 illustrate environmental structure of thedust mask, which forms no part of the claimed design.

CLAIM The ornamental design for a dust mask, as shown and described.